Radio DX Equipment

Does your radio look like it will accept a connector like the gold tip below?

If so, I use both of these and a pair of rabbit ears… fully extended in a dipole it gives a wingspan of 150 cm and folds up easily. Works a lot better than just the 70cm whip like you had.

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I remembered I had an old BNC scanner antenna and a SMA to BNC adapter on my SDR, so this will do the job, not quite as good on AM weirdly enough but works very well on FM band due to the length

EDIT: nah about the same on AM

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Bugger. I posted on the DX thread some months ago about this.
I recall @dxnerd has gone through several antennas.
After a lot of trial & error I’ve settled on a longer antenna with F connector & appropriate SMA adaptors.
I’ve purchased 3-4 antennas so far, some adaptors & even some ‘connector end’ antenna pieces that are also available from AliExpress rather than having to buy a whole new telescopic antennas each time. If you have any troubles finding any of these on AliExpress let me know & I’ll login into AliExpress & retrieve details for you.

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On the black TEF units, despite the Mod Meter showing percent, am i correct in thinking it is actually reading Deviation in KHz?
The reason I ask is i know a local station that runs about 105% mod yet the TEF only shows 80%

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Try throwing this question out on the Quick-Support forum on the Discord site, you’ll likely get a quick & accurate reply. Be good to read the feedback here too. :slight_smile:

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Nowhere near accurate. TEF6686’s surprisingly good at a lot of things, that’s not one of them.

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Ignoring whatever percentages the dots are meant to represent, it aligns accurately with the numbers when testing with a continuous tone.

On AM, 50% modulation was in the middle of the “50”, 100% in the middle of “100”, etc. And for FM, 75kHz was in the middle of “100”.

However, even though that’s accurate, stations on AM (which I believe are 125% positive modulation) still only peak around 80-90%, as do FM stations, the same as what you’re seeing. ¯\_(ツ)_/¯

Also, it’s recommended (I assume mostly for AM) to disable the mod meter to reduce interference. Or better yet, set the screensaver to turn off the screen.

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Thanks for the replies everyone, yeah i figured the meter was not very acurate which is why i was not sure if it was meant to be Mod Percentage or Deviation on FM… As for on AM, 4GR here is doing 125% and yeah only reads 80ish percent so not terribly accurate

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I don’t think meters on consumer grade products were ever meant to be absolutely accurate in that respect, but would still give you a relative indication of things like signal strength compared to other stations on that radio.

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Nah have test gear at work to test that sort of stuff anyway was just intrested in what the meter was actually reading

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Reading poorly!

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Got my new TEF radio and you bet I updated the firmware and calibrated the signal neter :joy:

EDIT: Before someone says the Tiny SA isnt accurate, tested it’s output with a R&S Spectrum Analyser and it is within 0.5dBm of what it says it is outputting

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What’s your offset for FM? I found mine to be +5dB.

What did you change the RF Gain on the TEF too? (I think mine goes up to +25 and down to -15, assuming yours has the same settings/range).

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To answer you both adjusted the offset as follows

+3 on FM
-17 on AM calibrated close as I could for MF (didn’t worry about SW or LW

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Quick @gordo92 you’d better remove the screen protector before somebody complains. :rofl: :rofl:
Nice having access to that equipment :+1:

Are the gain level display figures consistent across the entire FM band?

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Mine is -21 for AM. Only problem is, it affects the receive, so with weaker stations, there’s reduced treble/noise. Whether or not that’s a positive or negative is up to you.

I have not touched the AGC gain, just changed the offset for the meter

Mostly within .2dbm I found

LoL :joy:

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I stand corrected, changing the AM offset DOES affect AM reception particularly DX stations

Back to 0db mine goes on AM, not to concerned about having the signal meter not as accurate on AM for better reception

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Ooh, i wonder if that is what the problem with mine on AM is? Though i don’t think I’ve ever changed it. It gets barely anything on AM with the rabbit ears.

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